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2c-40=-2c-20
We move all terms to the left:
2c-40-(-2c-20)=0
We get rid of parentheses
2c+2c+20-40=0
We add all the numbers together, and all the variables
4c-20=0
We move all terms containing c to the left, all other terms to the right
4c=20
c=20/4
c=5
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